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Table 1 Compositions of different sample areas (wt%)

From: The earliest known artificial synthesized ε-Fe2O3 in the Deqing Kiln ceramic ware of Tang Dynasty

 

PE

GE

PA

GA

FE

GF

CG

G

B

Na2O

2.1 ± 0.2

3.7 ± 0.5

1.9 ± 0.2

4.1 ± 0.3

1.8 ± 0.2

3.5 ± 0.4

4.5 ± 0.2

1.3 ± 0.1

2.3 ± 0.1

MgO

2.5 ± 0.4

1.2 ± 0.3

1.8 ± 0.3

1.1 ± 0.2

1.9 ± 0.1

1.8 ± 0.2

1.4 ± 0.2

2.1 ± 0.1

1.1 ± 0.1

Al2O3

17.2 ± 0.3

12.6 ± 2.4

14.2 ± 0.5

15.3 ± 1.6

14.7 ± 0.2

16.4 ± 1.3

16.0 ± 0.9

12.8 ± 0.2

19.4 ± 0.5

SiO2

34.6 ± 1.2

73 ± 5

36.7 ± 2.0

67.2 ± 2.5

54.0 ± 0.7

62.4 ± 2.8

65.3 ± 1.8

54.9 ± 0.4

69.8 ± 0.8

P2O5

0.0 ± 0.1

0.1 ± 0.1

0.0 ± 0.1

0.1 ± 0.1

0.2 ± 0.1

0.1 ± 0.1

0.1 ± 0.1

0.4 ± 0.1

0.0 ± 0.1

Cl2O

0.2 ± 0.1

0.0 ± 0.1

0.2 ± 0.1

0.0 ± 0.1

0.0 ± 0.1

0.0 ± 0.1

0.0 ± 0.1

0.0 ± 0.1

0.0 ± 0.1

K2O

4.2 ± 0.3

3.5 ± 0.6

4.2 ± 0.3

5.5 ± 0.4

4.1 ± 0.1

3.6 ± 0.5

4.8 ± 0.4

1.5 ± 0.1

2.9 ± 0.2

CaO

1.5 ± 0.1

1.2 ± 0.2

1.4 ± 0.1

1.8 ± 0.3

4.9 ± 0.4

4.8 ± 0.4

1.8 ± 0.3

19.5 ± 0.4

0.8 ± 0.1

TiO2

1.7 ± 0.1

0.6 ± 0.2

1.5 ± 0.2

1.4 ± 0.4

1.0 ± 0.1

1.1 ± 0.2

0.8 ± 0.2

0.9 ± 0.1

0.9 ± 0.1

MnO2

0.4 ± 0.1

0.1 ± 0.1

0.3 ± 0.1

0.2 ± 0.1

0.3 ± 0.1

0.3 ± 0.1

0.1 ± 0.1

0.4 ± 0.1

0.1 ± 0.1

Fe2O3

35.7 ± 1.2

3.9 ± 1.5

37.7 ± 2.0

3.4 ± 0.6

17.1 ± 0.8

5.9 ± 1.1

5.2 ± 0.9

6.1 ± 0.2

2.7 ± 0.2

SiO2/Al2O3

2.0 ± 0.1

5.8 ± 1.2

2.6 ± 0.2

4.4 ± 0.5

3.7 ± 0.1

3.8 ± 0.4

4.1 ± 0.3

4.3 ± 0.1

3.6 ± 0.1

  1. PE ε-Fe2O3, GE glass phase around the ε-Fe2O3, PA α-Fe2O3, GA glass phase around the α-Fe2O3, FE large feathery dendrites ε-Fe2O3, GF glass phase around the large feathery dendrites ε-Fe2O3, CG common glass phase, G glaze, B body